Magnesium hydroxide in ibuprofen tablet reduces the gastric mucosal tolerability of ibuprofen.
2004
Goal: The study was designed to compare the gastrointestinal tolerability of a
magnesium
hydroxide-containing
ibuprofentablet (buffered
ibuprofen) and the conventional
ibuprofentablet in healthy volunteers. Background:
Magnesium
hydroxidehas been shown to increase the rate of absorption of
ibuprofen. Methods: A double blind, randomized, 2-period
crossover studydesign was used. Twenty healthy men ingested 800 mg
ibuprofen3 times daily either in conventional tablets (2 doses of 400 mg) or in tablets containing
magnesium
hydroxide(2 doses of 400 mg
ibuprofenand 200 mg
magnesium
hydroxide). On the 5th day only the morning dose was administered. Endoscopy was performed at baseline and on the 5th day in both treatments 2 hours after the last dose, and gastric pH was determined. In addition, plasma concentrations of
ibuprofenwere determined up to 90 minutes. Results: The
magnesium
hydroxide-containing formulation increased the number of subjects evincing erosions in gastric corpus and antrum. In the gastric corpus 2 and 7 volunteers had erosions after conventional and buffered
ibuprofen, respectively (P = 0.08). In the gastric antrum 5 and 13 volunteers showed erosions after conventional and buffered
ibuprofen, respectively (P = 0.02). There was a trend toward faster absorption of
ibuprofenwhen given together with
magnesium
hydroxide. The difference was not however statistically significant. Conclusions: Prolonged use of
magnesium
hydroxidetogether with high doses of
ibuprofenshould be avoided, because the combination may incur a higher risk of gastrointestinal irritation.
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